With the U.S. Open Tennis Tournament in full swing, we’ve turned to Nick Bollettieri. His tennis academy in Florida has turned out some of the sport’s greatest players over the past 60 years. We turned to him because parents all over the country, whose young children are in tennis clinics, are starting to see something new. A different type of tennis ball. It doesn’t bounce as high as a regular ball. So it’s easier to hit. And it’s used on a smaller court. Is that the way to train a champ? A lot of coaches and parents don’t think so. Bollettieri was skeptical at first, but is now a believer. He tells CNN's Michael Schulder why and also, what he looks for in a young tennis player – how to spot potential. And he tells us one thing you might never have noticed – about the new spot all players must position themselves on the court for their ground strokes – whether it’s the U.S. Open or any other tournament.